rabbitmq入门学习五

    rabbitmq入门学习五


1. 主题模型(Topics)

                

主题模式：

1、每个消费者监听自己的队列，并且设置带统配符的routingkey。

2、生产者将消息发给broker，由交换机根据routingkey来转发消息到指定的队

看下图例子：

解释：

红色Queue：绑定的是usa.# ，因此凡是以 usa.开头的routing key 都会被匹配到

黄色Queue：绑定的是#.news ，因此凡是以 .news结尾的 routing key 都会被匹配到

 

业务需求：

  最常见的增删改，需要不同的系统去处理，

1.1 生产者代码

使用topic类型的Exchange，发送消息的routing key有3种： item.isnert、item.update、item.delete

[Java] 纯文本查看 复制代码

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public class TopicsProducer {     //队列名称     private static final String QUEUE_INFORM_1 = "topic_exchange_queue_1";     private static final String QUEUE_INFORM_2 = "topic_exchange_queue_2";     private static final String QUEUE_INFORM_3 = "topic_exchange_queue_3";     private static final String EXCHANGE_TOPICS_INFORM="exchange_topics_inform";     private static final String ROUTINGKEY_UPDATE="item.update";     private static final String ROUTINGKEY_DELETE="item.delete";     private static final String ROUTINGKEY_INSTALL="item.install";     private static final String ROUTINGKEY_ALL="item.#";       public static void main(String[] args) {         Connection connection = null;         Channel channel = null;         try {             //建立新连接             connection = ConnectionUtil.getConnection();             //创建会话通道,生产者和mq服务所有通信都在channel通道中完成             channel = connection.createChannel();             channel.queueDeclare(QUEUE_INFORM_1, true, false, false, null);             channel.queueDeclare(QUEUE_INFORM_2, true, false, false, null);             channel.queueDeclare(QUEUE_INFORM_3, true, false, false, null);             //声明一个交换机             channel.exchangeDeclare(EXCHANGE_TOPICS_INFORM, BuiltinExchangeType.TOPIC);             //进行交换机和队列绑定             channel.queueBind(QUEUE_INFORM_1, EXCHANGE_TOPICS_INFORM, ROUTINGKEY_UPDATE);             channel.queueBind(QUEUE_INFORM_1, EXCHANGE_TOPICS_INFORM, ROUTINGKEY_DELETE);             channel.queueBind(QUEUE_INFORM_2, EXCHANGE_TOPICS_INFORM, ROUTINGKEY_INSTALL);             channel.queueBind(QUEUE_INFORM_3, EXCHANGE_TOPICS_INFORM, ROUTINGKEY_ALL);             //发送消息             //发送消息的时候指定routingKey             String message = "新增商品";             channel.basicPublish(EXCHANGE_TOPICS_INFORM, "item.install", null, message.getBytes()); //                String message = "删除商品"; //                channel.basicPublish(EXCHANGE_TOPICS_INFORM, "item.delete", null, message.getBytes()); //                String message = "修改商品"; //                channel.basicPublish(EXCHANGE_TOPICS_INFORM, "item.update", null, message.getBytes());             System.out.println("send to mq " + message);         } catch (Exception e) {             e.printStackTrace();         } finally {             //关闭连接             //先关闭通道             try {                 channel.close();             } catch (IOException e) {                 e.printStackTrace();             } catch (TimeoutException e) {                 e.printStackTrace();             }             try {                 connection.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     } }

1.2 消费者代码1

消费者1代码，接收两种路由模式item.update和item.delete

[Java] 纯文本查看 复制代码

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public class TopicsComsumer1 {     //队列名称     private static final String QUEUE_INFORM_1 = "topic_exchange_queue_1";;     private static final String EXCHANGE_TOPICS_INFORM="exchange_topics_inform";     private static final String ROUTINGKEY_UPDATE="item.update";     private static final String ROUTINGKEY_DELETE="item.delete";         public static void main(String[] args) throws Exception {         //建立新连接         Connection connection = ConnectionUtil.getConnection();         //创建会话通道,生产者和mq服务所有通信都在channel通道中完成         Channel channel = connection.createChannel();           channel.queueDeclare(QUEUE_INFORM_1,true,false,false,null);         //声明一个交换机         channel.exchangeDeclare(EXCHANGE_TOPICS_INFORM, BuiltinExchangeType.TOPIC);         //进行交换机和队列绑定         channel.queueBind(QUEUE_INFORM_1, EXCHANGE_TOPICS_INFORM,ROUTINGKEY_UPDATE);         channel.queueBind(QUEUE_INFORM_1, EXCHANGE_TOPICS_INFORM,ROUTINGKEY_DELETE);         //实现消费方法         DefaultConsumer defaultConsumer = new DefaultConsumer(channel){             @Override             public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {                 //交换机                 String exchange = envelope.getExchange();                 //消息内容                 String message= new String(body,"utf-8");                 System.out.println("【消费者1】:"+message);             }         };         //监听队列         channel.basicConsume(QUEUE_INFORM_1,true,defaultConsumer);       } }

1.3 消费者代码2

  消费者2代码，只接收item.Install

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public class TopicsComsumer2 {     //队列名称     private static final String QUEUE_INFORM_2 = "topic_exchange_queue_2";     private static final String EXCHANGE_TOPICS_INFORM="exchange_topics_inform";     private static final String ROUTINGKEY_INSTALL="item.install";       public static void main(String[] args) throws Exception {         //建立新连接         Connection connection = ConnectionUtil.getConnection();         //创建会话通道,生产者和mq服务所有通信都在channel通道中完成         Channel channel = connection.createChannel();           channel.queueDeclare(QUEUE_INFORM_2,true,false,false,null);         //声明一个交换机         channel.exchangeDeclare(EXCHANGE_TOPICS_INFORM, BuiltinExchangeType.TOPIC);         //进行交换机和队列绑定         channel.queueBind(QUEUE_INFORM_2, EXCHANGE_TOPICS_INFORM,ROUTINGKEY_INSTALL);           //实现消费方法         DefaultConsumer defaultConsumer = new DefaultConsumer(channel){             @Override             public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {                 //交换机                 String exchange = envelope.getExchange();                 //消息内容                 String message= new String(body,"utf-8");                 System.out.println("【消费者2】:"+message);             }         };         //监听队列         channel.basicConsume(QUEUE_INFORM_2,true,defaultConsumer);       } }

1.4 消费者代码3

消费者代码3，只接收item.#，只要以item.开头的路由key该消费者都可以接收

[Java] 纯文本查看 复制代码

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public class TopicsComsumer3 {     //队列名称     private static final String QUEUE_INFORM_3 = "topic_exchange_queue_3";     private static final String EXCHANGE_TOPICS_INFORM="exchange_topics_inform";     private static final String ROUTINGKEY_ALL="item.#";       public static void main(String[] args) throws Exception {         //建立新连接         Connection connection = ConnectionUtil.getConnection();         //创建会话通道,生产者和mq服务所有通信都在channel通道中完成         Channel channel = connection.createChannel();           channel.queueDeclare(QUEUE_INFORM_3,true,false,false,null);         //声明一个交换机         channel.exchangeDeclare(EXCHANGE_TOPICS_INFORM, BuiltinExchangeType.TOPIC);         //进行交换机和队列绑定         channel.queueBind(QUEUE_INFORM_3, EXCHANGE_TOPICS_INFORM,ROUTINGKEY_ALL);         //实现消费方法         DefaultConsumer defaultConsumer = new DefaultConsumer(channel){             @Override             public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {                 //交换机                 String exchange = envelope.getExchange();                 //消息内容                 String message= new String(body,"utf-8");                 System.out.println("【消费者3】:"+message);             }         };         //监听队列         channel.basicConsume(QUEUE_INFORM_3,true,defaultConsumer);       } }

1.5 测试

运行生产者代码测试，我们发现交换机绑定的队列中routingkey有值了，分别为：

Item.delete，item.update，item.install，item.#。

    

 

然后我们继续运行三个消费者查看消息接收情况：通过下面三张消费者截图，我们可以看出，只有绑定了item.install和item.#的队列可以接收消息，而队列1绑定的是item.delete和item.update无法接收消息。

消费者1：

消费者2：

消费者3：